Boyle P. C., Groot T. de, Andralojc K. M., Parnell T. A., Healthy Singleton Pregnancies From Restorative Reproductive Medicine (RRM) After Failed IVF, „Frontiers in Medicine” 5 (2018), s. 210, doi: 10.3389/fmed.2018.00210. Cheong Y., Bailey S., Forbes J., Randomized Controlled Trial of Hyalobarrier(®) Versus No Hyalobarrier(®) on the Ovulatory Status of Women with Periovarian Adhesions: A Pilot Study, „Advances in Therapy” 1(34) (2017), s. 199-206, doi: 10.1007/s12325-016-0453-z. Eurostat, Fertility statistics, 2021, https://ec.europa.eu/eurostat/statisticsexplained/index.php?title=Fertility_statistics (odczyt z dn. 10.09.2021 r.). Hanson B., Johnstone E., Dorais J., Silver B., Peterson C. M., Hotaling J., Female infertility, infertility-associated diagnoses, and comorbidities: a review, „Journal of Assisted Reproduction and Genetics” 2(34) (2017), s. 167-177, doi: 10.1007/s10815-016-0836-8. Hilgers T. W., The Medical & Surgical Practice of NaProTechnology, Omaha 2004. Hilgers T. W., The NaProTechnology Revolution: Unleashing the Power in a Woman’s Cycle, New York, NY, 2010. Jose-Miller A. B., Boyden J. W., Frey K. A., Infertility, „American Family Physician” 6(75) (2007), s. 849-856. Legro R. S., Obesity and PCOS: implications for diagnosis and treatment, „Seminars in Reproductive Medicine” 6(30) (2012), s. 496-506, doi: 10.1055/s-0032-1328878. Paweł VI, Encyklika Humanae vitae, Rzym 1968, 24. Stanford J. B., Parnell T. A., Boyle P. C., Outcomes from treatment of infertility with natural procreative technology in an Irish general practice, „Journal of the American Board of Family Medicine” 5(21) (2008), s. 375-384, doi: 10.3122/jabfm.2008.05.070239. Tanbo T., Fedorcsak P., Endometriosis-associated infertility: aspects of pathophysiological mechanisms and treatment options, „Acta Obstetricia et Gynecologica Scandinavica” 6(96) (2017), s. 659-667, doi: 10.1111/aogs.13082. Terlikowski T. P., Hilgers T. W., Nadzieja na dziecko, czyli cała prawda o naprotechnologii, Warszawa 2015.